JPH1055742A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely, surely force to break a circuit in an emergency with simple, low cost structure. SOLUTION: A breaker has a housing including a housing main body 10, and a conductor 20. A cylinder part such as an inner cylinder part 34, and a cover part 16 covering the opening of the cylinder part are formed in the housing. A connecting terminal parts 26 are formed at both ends of the conductor 20 and a breaking part 22 is formed in the middle part, the breaking part 22 is arranged at the opening tip of the cylinder part, and both connecting terminal parts 26 are introduced into the outside of the housing. Gunpowder 46 and a filament 44 serving as a heating means for the gunpowder are arranged in the cylinder part, and the explosion force of the gunpowder 46 exploding by heating is concentrated on the breaking part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker provided in an automobile or the like.

[0002]

2. Description of the Related Art Generally, in electric circuits for automobiles and the like,
Fuses and fusible links are commonly used as a means for immediately breaking a circuit when an overload current or a short-circuit current occurs. These fuses and fusible links have a fusible conductor inside the container and have a basic structure with connection terminals led out of the container.Most of them are connected to electrical junction boxes and used. Have been.

However, the fuse and the fusible link blow out only when an overcurrent is generated and cut off the circuit, so that the circuit cannot be forcibly cut off at an arbitrary timing. Therefore, in the event of an emergency such as when a vehicle accident occurs, if it is desired to forcibly shut off the circuit without overcurrent flowing for safety reasons, replace the fuse or fusible link above, or use an external It is necessary to install a circuit breaker that can forcibly cut off the circuit by the operation from.

[0004] As a circuit breaker of the latter type, Japanese Patent Publication No. 58-47809 discloses a circuit breaker in which the conductor is forcibly broken using the explosive force of explosive.
In this circuit breaker, an output fuse, an explosive, and a filament for heating the explosive are enclosed in a single enclosed glass, and an input terminal connected to the filament penetrates the enclosed glass. It is led out of the sealed glass, and the surface of the sealed glass is provided with an explosion-proof coating.

[0005] According to such a circuit breaker, the filament is heated by applying a certain amount of current or voltage to the input terminal, and the explosive is exploded by the heat. Can be forcibly broken. Therefore, when an abnormality such as a short circuit of the electric circuit occurs, the circuit can be interrupted at an arbitrary timing by controlling the input current or the input voltage to the input terminal.

[0006]

In the circuit breaker disclosed in the above publication, the explosive force of the explosive is diffused in all directions in the enclosed glass, and only a part of the explosive acts on the output fuse, so that the fuse is reliably broken. In order to do so, a considerable amount of explosive power is required. However, if the explosive power is increased by increasing the amount of explosive, etc., the explosive power acting on the inner surface of the sealing glass other than the output fuse also increases. It is necessary to use special processing or special processing, and the increase in cost cannot be avoided.

The present invention has been made in view of the above circumstances, and has a simple and inexpensive structure so that an emergency circuit can be safely and reliably shut off by making the explosive energy of an explosive act efficiently on a break portion. The purpose is to provide a vessel.

[0008]

As a means for solving the above-mentioned problems, the present invention provides a tubular member made of an insulating material and having at least one opening in one direction and a conductor accommodating space at the opening of the tubular portion. A housing having a cover part covering the opening, a conductor having connection terminal parts at both ends and a conductor having a breakable part at an intermediate part, and the broken part of the conductor is formed in the conductor accommodating space by the cylinder. Placed at the opening of the part,
The two connection terminal portions are led out of the housing in a state in which the portion between the broken portion and the two connection terminal portions penetrates the housing, and the explosive and the power supply from the outside are supplied into the cylinder portion by the explosive and the power supply from the outside. A heating means for heating and exploding the explosive is provided so that the explosive force of the explosive breaks the break portion.

According to this configuration, the explosive and its heating means are provided in the cylindrical portion which opens toward the breakage portion. Therefore, when the explosive explodes due to heating by the heating means, the explosive power is reduced. The action will be concentrated on the broken portion. Therefore, it is possible to reliably break the break portion while setting the explosive power of the explosive relatively low,
Damage to the housing due to the explosive force can be significantly reduced. Therefore, the circuit can be safely and reliably shut off without using an expensive material or performing special treatment for the housing.

The explosive and its heating means may be directly inserted into the cylindrical portion. However, these are once sealed in a sealing member to form an explosive seal portion, and this explosive seal portion is inserted into the cylindrical portion. By doing so, the insertion operation is easy, and the explosive and its heating means can be reliably waterproofed and dustproof.

In this case, the explosive and its heating means and the sealing member may be integrally formed, or the explosive and its heating means may be enclosed in a capsule. In the latter case, if the capsule is made of a heat-shrinkable resin,
After the explosive and its heating means are put in the capsule, the capsule can be easily sealed simply by heating and shrinking the inlet of the capsule.

The housing may be integrally formed as a whole, but the housing includes a housing body having an outer cylinder portion opening in and out and the cover portion, and an inner cylinder portion opening in one direction. Then, if the inner cylindrical portion is constituted by a cylindrical member inserted into the outer cylindrical portion in a state of being opened inward of the housing main body, and the explosive seal portion is inserted into the inner cylindrical portion, first, The explosives and the like can be set by a simple operation such as taking out only the inner cylinder portion, inserting the explosive seal portion therein, and then inserting the entire inner cylinder portion into the outer cylinder portion.

Further, if a small-diameter cylindrical portion having a smaller diameter than the cylindrical portion is provided in the cylindrical portion between the explosive and the heating means and the broken portion, the degree of concentration of the explosive force on the broken portion can be further increased. Can be enhanced.

Further, by making the inner peripheral surface of the small-diameter cylindrical portion tapered so as to decrease in diameter toward the breaking portion, loss of explosion energy can be reduced and higher explosive force can be concentrated on the breaking portion. .

[0015] It is more preferable that a protective member for covering the housing is provided outside the housing. According to this configuration, the housing is made of, for example, a lightweight and easily moldable synthetic resin, or the cover is provided with a communication hole communicating between the inside and the outside, thereby suppressing an increase in the internal pressure of the cover and rupture of the cover. By arranging a high-strength protective member on the outside while preventing the above, high safety can be secured.

The cover provided with the communication hole may be provided with a filter for covering the installation portion of the communication hole. In such a case, the internal pressure rise obtained by providing the communication hole may be increased. Without impairing the suppression function of the above, the filter prevents the fragments blown out by the explosion of the explosive from jumping out of the communication hole to the outside.

The cover may be provided with a waterproof portion covering the installation portion of the communication hole, and the waterproof portion may be broken by the explosive force of the explosive. During normal times, the waterproof portion prevents moisture from entering the cover portion through the communication hole, and when explosive explosives are exploded, the waterproof portion is broken and air in the cover portion passes through the communication hole. As a result, the internal pressure of the cover is suppressed from rising.

A bottom plate that covers the lower surface of the cylindrical member into which the explosive has been inserted, an upper cover that covers the bottom plate and the upper portion of the cylindrical member, and a lower cover that covers the lower portion of the lower plate and the cylindrical member. A housing body may be formed, and both ends may be connected in a state where the lower end of the upper cover and the upper end of the lower cover are overlapped. In this case, since the periphery of the cylindrical member into which the explosive has been inserted is covered by the upper cover and the lower cover, the explosive force of the explosive is effectively prevented from reaching the outside of the housing body. become.

When the lower cover is integrally formed so as to cover the lower outer surface of the upper cover and the outer surface of the bottom plate, the bottom plate, the upper cover, and the lower cover are firmly connected to each other. And the airtightness of the housing body is improved.

The above-mentioned circuit breaker can be arranged in a suspended state. However, if the housing or the conductor is fixed to the base, the loss of explosion energy is further reduced,
The breaking force at the breaking portion is further enhanced by the reaction force received from the base.

In particular, if the housing or the conductor is fixed on the outer surface of the electric connection box and the connection terminal portion is electrically connected to a circuit in the electric connection box, the conductor and the electric connection box can be connected to each other. This eliminates the need for wiring such as a cable connecting the two, thereby simplifying the entire system.

[0022]

FIG. 1 shows a first embodiment of the present invention.
A description will be given based on FIG.

The circuit breaker shown here comprises a housing body 10 and a tubular member 30 constituting a housing, a conductor 20 constituting an electric circuit, and an explosive seal portion 40 disposed in the tubular member 30. Have.

The housing body 10 has a through hole 12 at the center.
And a cover 16. The through hole 12 is open at both the upper and lower sides. The cover 16 is formed so as to cover an upper opening of the through hole 12, and a predetermined conductor housing space is formed inside the cover 16. . The housing body 10 may be formed, for example, by molding the central portion of the outer cylindrical portion 14, integrally molding the outer peripheral portion of the outer cylindrical portion 14 and the cover portion 16, and then joining the molded products together. By
Manufacturing is possible.

The material of the housing body 10 may be any material having an insulating property, for example, ceramic. However, it is lightweight and easy to mold. Strength resins are preferred.

The conductor 20 includes a horizontal break portion 22, a pair of downward extension portions 24 extending downward from both ends of the break portion 22,
It has a connection terminal portion 26 extending from both ends of both lower extension portions 24 to both left and right outer sides.

The rupture portion 22 is formed to have a small width, and is designed so that it can be ruptured even with a low explosive force. Also,
In this embodiment, the conductor 20 is formed of a material equivalent to a material used for a general fuse, and the break portion 22 is blown even when an overcurrent occurs. The break portion 22 is disposed at a position immediately above the through hole 12 in the conductor storage space. Both lower extension parts 24 are
The outer cylindrical portion 14 of the housing body 10 is removed from the conductor housing space.
Therefore, both connection terminal portions 26 are led out of the housing main body 10 (in the illustrated example, both sides from the lower end of the housing main body 10). In addition, the break portion 22
A heat storage body 28 is attached to a boundary portion between the first and second lower extension portions 24.

The tubular member 30 is also formed of synthetic resin or the like, and has a shape in which an inner tubular portion 34 extends upward from a bottom portion 32. The bottom portion 32 has a pair of conductive wire insertion holes penetrating vertically. 36 are provided. The tubular member 30 is fixed to the inner peripheral surface of the tubular member 30 by bonding or the like while being fitted into the through hole 12, so that both upper and lower ends protrude vertically from the outer tubular portion 14, and the inner tubular portion 34. The upper end opening of the
It is located just below.

The explosive seal portion 40 is such that an explosive 46 is disposed around a filament 44 having both ends connected to a conductive wire 42, and these are sealed in a seal member 48. Both the conductive wires 42 pass through the seal member 48. It is led out below the lever sealing member 48. The sealing member 48 is preferably made of epoxy resin or rubber-like resin.
And the explosives 46 are directly or indirectly molded integrally with them with the explosives 46 included therein. The entirety of the explosive seal portion 40 is loaded into the inner cylindrical portion 30 of the cylindrical member 32, and both the conductive wires 42 led out of the seal member 48 are led out below the cylindrical member 30 through the both conductive wire insertion holes 36. ing.

The two connection terminals 26 are fixed to the upper surface of the base 50 by bolts 52 and the like. To these connection terminals 26, a lead derived from an electric circuit (not shown) is connected. ing. In addition, the conducting wire 42 led out from the cylindrical member 30 below is connected to a control unit (not shown) through an insertion hole provided in the base 50.

Next, the operation of the circuit breaker will be described.

When a vehicle accident or the like occurs, an abnormality command signal is input to the conductor 42, and the filament 44 is energized by this signal to generate heat. When the temperature of the explosive 46 reaches a certain level or more due to this heat, the explosive 46 explodes.

Here, in the conventional circuit breaker, since the above explosive force is diffused in all directions, only a part of the explosive force applied to the breaking portion 22 is increased. In other words, since the explosive seal portion 40 is filled in the inner cylinder portion 34 that opens only toward the break portion 22, the explosive force explodes when the explosive 46 explodes, and the explosive force is reduced while the seal portion 40 is broken. Acts concentrated on 22.
Therefore, the rupture portion 22 can be reliably ruptured even with a relatively low explosive force, and damage to the cylindrical member 30 and the cover portion 16 can be reduced. For this reason, sufficient safety can be ensured without using expensive high-strength materials or performing special explosion-proof treatment for the housing composed of the tubular member 30 and the housing body 10.

In particular, in this circuit breaker, since the lower surfaces of the housing and both connection terminals 26 are fixed to the upper surface of the base 50, the explosive force can be prevented from being released downward, and The explosive force applied to the rupture portion 22 can be enhanced by the upward reaction force received by the connection terminal portion 26 from the base 50.

In this circuit breaker, the tubular member 30 is omitted, and the explosive seal portion 40 is directly inserted into the through hole 12.
May be filled. However, in this case, it is necessary to fill the explosive seal portion 40 and then close the lower end opening of the through-hole 12. On the other hand, in the structure shown in FIGS. The advantage that the explosive seal portion 40 can be set by a simple operation by filling the explosive seal portion 40 into the inner cylindrical portion 32 of the member 30 and thereafter inserting the entire cylindrical member 30 into the through hole 12. There is.

Further, the filament 44 and the explosive 46 may be set directly in the inner cylindrical portion 34 and the through hole 12. However, after the explosive seal portion 40 as described above is formed in advance, By inserting the entirety of the explosive seal portion 40 into the cylindrical portion, there is obtained an advantage that the setting operation of the explosive 46 and the like can be more simplified, and the waterproof and dustproof of the explosive 46 can be further ensured.

FIG. 3 shows a second embodiment. Here, a protection member 54 that covers the entire housing body 10 is provided further outside the housing body 10.
According to such a structure, the housing body 10 and the cylindrical member 30 are made of a high-strength metal such as iron, copper, aluminum or an alloy thereof while the material of the housing body 10 and the cylindrical member 30 is made of a lightweight and easily moldable synthetic resin. By arranging the protection member 54, sufficient explosion resistance can be secured.

It is to be noted that, as the protective member 54, a thick member made of a high-strength resin or a high-toughness resin can be used in place of the above-mentioned metal member.

FIG. 4 shows a third embodiment. Here, a small-diameter cylindrical portion 56 is provided at the upper end of the inner cylindrical portion 34 so as to close it. The small-diameter tube portion 56 is
4 has a through hole 58 having an inner diameter smaller than the inner diameter.

The small-diameter cylindrical portion 56 can be fixed by forming screws to be screwed to each other on the outer peripheral surface of the small-diameter cylindrical portion 56 and the inner peripheral surface of the inner cylindrical portion 34 as shown in FIG. May be used.

According to such a structure, the presence of the small-diameter cylindrical portion 56 having an inner diameter smaller than that of the inner cylindrical portion 34 can further increase the concentration of the explosive force on the rupture portion 22.
The explosive power of the explosive 46 necessary for breaking the breaking portion 22 can be further reduced. This effect can be obtained, for example, even if the through hole 58 is flat (that is, the inside diameter is constant in the axial direction). However, if the through hole 58 is tapered as shown in the figure, a small diameter can be obtained. While reducing the impact on the cylinder 56 and reducing the loss of explosive energy,
The concentration of explosive power can be increased.

FIG. 5 shows a fourth embodiment. Here, an electric connection box 60 is used as a base of the circuit breaker, and the housing main body 10 and the like are directly fixed to an upper surface of a top plate 61 of the electric connection box 60. Specifically, a frame 62 is erected on the upper surface of the top plate 61, a lower portion of the housing body 10 is fitted inside the frame 62, and a lower portion of the protection member 54 is fitted around the frame 62.

The connection terminal 26 extends downward from the housing body 10 and is provided with a through hole 6 formed in the top plate 60.
3 faces the inside of the electric junction box 60. A current circuit is incorporated inside the electric connection box, and a pair of terminal plates 64 and the two connection terminal portions 26 constituting the circuit are provided.
Are mechanically and electrically connected by bolts 65. In the housing of the electric junction box 60, an electric wire 66 derived from a control circuit (not shown) is wired.
These electric wires 66 and the conducting wires 36 from the circuit breaker are electrically connected.

As described above, if the housing body 10 and the like are directly fixed to the outer surface of the electric connection box 60, unlike the other cases, cables and the like for connecting the circuit breaker and the electric connection box become unnecessary. Thus, the entire system can be simplified.

FIG. 6 and FIG. 7 show a fifth embodiment.

In this embodiment, the explosive seal portion 40 is formed using a capsule 47 or the like as shown in FIG. The capsule 47 is formed in a thin-walled container shape opened only downward by stainless steel or the like. In a state where the filament 47 and the explosive 46 are filled in the capsule 47, a lid 49 is attached so as to close the lower end opening of the capsule 47. And is fixed by appropriate means. The lid 49 is provided with a pair of conducting wire insertion holes 49a.
Through 9a, a pair of conducting wires 42 connected to the filament 44 are led out of the capsule 47. As shown in FIG. 6, the entirety of the explosive seal 40 is directly loaded into the through hole 12 of the housing body 10 and fixed by means such as adhesion.

Even in such a configuration, a circuit breaker can be easily assembled simply by loading the previously completed explosive seal portion 40 into the through-hole 12. Since the capsule 47 is pierced upward and the explosive force is concentrated and acts on the break portion 22, the break portion 22 can be reliably broken. Before the explosion, the explosive 46 is sealed in the capsule 47,
Waterproofing and dustproofing can be reliably performed.

Further, as shown in FIG. 8 as a sixth embodiment, the explosive seal portion 40 is formed in the through hole 12.
By sealing the upper and lower spaces or one of the spaces with the sealing material 48, the above waterproof and dustproof effects can be further enhanced, and the explosive seal portion 40 can be more securely fixed.

If the material of the capsule 47 is a heat-shrinkable resin, the filament 44
After filling the explosive 46, the opening of the capsule 47 can be easily closed only by heating the opening, and the explosive 46 and the like can be securely sealed in the capsule. Also in this case, only the conductive wire 42 may be drawn out from the opening.

FIG. 9 shows a seventh embodiment. Here, a communication hole 18 communicating the inside and outside of the cover portion 16 is provided at an appropriate position (the top portion in the illustrated example) of the cover portion 16, and the above-described protection member 54 is disposed outside the communication hole 18. According to such a structure, it is possible to prevent the internal pressure of the cover portion 16 from suddenly increasing at the time of an explosion by bleeding air through the communication hole 18, and the entire cover portion 16 is ruptured due to the increase in the internal pressure. Can be prevented more reliably. Moreover, by disposing the protection member 54 on the outside, the communication hole 18
The high-pressure air ejected from the air can be prevented from directly hitting other parts or the like. Also, as shown in FIG.
A filter 71 made of a reticulated metal material or a porous metal material is attached to the inner surface of the cover 16.
It may be configured so as to cover the installation portion of the communication hole 18. With this configuration, without providing the protection member 54 and the like, it is possible to effectively prevent fragments of the seal member 48 broken by the explosion of the explosive 46 from jumping out of the communication hole 18 to the outside. By leading the air in the cover portion 16 to the outside through the communication hole 18, an increase in the internal pressure can be prevented.

A waterproof portion made of a waterproof sheet 72 which is easily broken by the explosive force of the explosive 46 of the explosive is attached to the outer surface of the cover portion 16.
2 may cover the installation portion of the communication hole 18. In the case of such a configuration, the waterproof sheet 72 prevents moisture from entering the cover portion 16 from the communication hole 18 at normal times, and the explosive 46
At the time of the explosion, by breaking the waterproof sheet 72 by the explosive force, the air in the cover 16 can be led out from the communication hole 18 to the outside to prevent the internal pressure from rising.

As shown in FIG. 11, a thin closing portion 73 for closing the upper ends of the cover 16 and the communication hole 18 is provided.
Are formed integrally, and the waterproof portion formed of the closing portion 73 is broken by the explosive force of the explosive 47, so that the inside and the outside of the cover portion 16 can communicate with each other through the communication hole 18. Good.

As shown in FIG. 12, a bottom plate 76 to which a mounting portion 74 protruding laterally from a lower end of the cylindrical member 30 into which the explosive seal portion 40 is inserted is screwed by a mounting bolt 75. The housing body 10 is constituted by the bottom plate 76 and an upper cover 77 covering the upper part of the cylindrical member 30 and the lower cover 78 covering the lower part of the cylindrical member 30 and the bottom plate 76. Both ends may be connected in a state where the lower end and the upper end of the lower cover 78 are overlapped.

That is, the upper cover 77 is provided on the lower inner surface with the stepped portion 8 which comes into contact with the upper surface of the mounting portion 74 of the tubular member 30.
2 and the upper surface 7 covering the upper surface thereof
The upper surface 64 has a plurality of communication holes 18 formed therein. The lower cover 78 includes a bottom wall 79 that covers a lower end opening of the upper cover 77 and a side wall 80 that covers a lower outer peripheral surface of the upper cover 77. These are integrally connected by being screwed to the cylindrical portion 83 of 77.

According to the above configuration, the periphery of the cylindrical member 30 in which the explosive seal portion 40 is inserted is covered by the bottom plate 76, the upper cover 77, and the lower cover 78. It can be effectively prevented from reaching the outside of the housing body 10.

In the embodiment shown in FIG. 12, the lower extension portions 24, 2 of the conductor extending downward from both ends of the break portion 22 are provided.
4 is drawn out downward through a through hole formed in the bottom plate 59. As shown in FIG.
After the lower portions of the lower extension portions 24, 24 connected to 2 are led out laterally along the lower surface of the cylindrical member 30 and the upper surface of the bottom plate 76, and are bent along the side surfaces and the lower surface of the bottom plate 76 The lower cover 78 is configured to penetrate the bottom wall portion 79 of the lower cover 78 and to be led out downward, and the lower extension portions 24 are fixed to the bottom plate 76 and the bottom wall portion 79 of the lower cover 78 by mounting bolts 75. May be configured.

In the case of such a configuration, the installation interval of the lower portions 24b, 24b of the lower extension regulated by the connector or the like provided on the substrate 50 and the insertion hole formed in the cylindrical member 30 are used. Regulated lower extension 24, 24
There is an advantage that even if there is a difference between them, the lower extension portions 24 of the conductor can be easily and appropriately wired. As shown in FIG. 14, the upper portions of the lower extending portions 24, 24 and the lower portions 24b, 24b are formed separately, and these ends are connected to the mounting bolts 75, respectively.
May be configured so as to be connected to each other by being overlapped with each other in the installation section.

As shown in FIG. 15, an upper cover 69 having a flange 68 projecting from the lower end is fitted to the cylindrical member 30 holding the explosive seal 40, and the upper cover 69 The lower cover 70 may be integrally formed by, for example, injecting a molding resin material into a mold and performing molding molding so as to surround the lower portion and the outside of the bottom plate 76. With such a configuration, there is an advantage that the coupling strength between members of the upper cover 69, the bottom plate 76, and the lower cover 70 and the airtightness can be effectively improved.

[0059]

As described above, according to the present invention, a broken portion of a conductor is arranged at an opening of a cylindrical portion of a housing, and an explosive and a heating means for the explosive are provided in the cylindrical portion. Therefore, the breaking portion can be reliably broken with relatively low explosive force. Therefore, there is an effect that the circuit can be safely and reliably shut down urgently with a simple and inexpensive structure.

Here, the explosive and its heating means are sealed in a sealing member to form an explosive seal portion, and the explosive seal portion is inserted into the cylindrical portion, thereby facilitating the setting operation of the explosive and the like. This has the effect of making it possible to surely waterproof and dustproof explosives.

In this case, the explosive seal portion can be manufactured with a simple structure by integrally molding the explosive and its heating means and the sealing member, or by enclosing the explosive and its heating means in a capsule. . In particular, in the latter case,
When the capsule is made of a heat-shrinkable resin, an effect can be obtained in which the explosive and its heating means can be securely sealed with a simple operation of heating the capsule.

The housing has a housing main body having an outer cylindrical portion opening inward and outward and the cover portion, and an inner cylindrical portion opening in one direction, and the inner cylindrical portion opens inward of the housing main body. According to a configuration in which the explosive is inserted into the inner cylinder portion in a state in which the explosive is inserted into the inner cylinder portion, the work of setting the explosive or the like into the housing is further facilitated. The effect that can be obtained is obtained.

Further, according to the present invention, a small-diameter cylindrical portion having a diameter smaller than that of the cylindrical portion is provided in the cylindrical portion between the explosive and the heating means and the broken portion. The degree of explosion can be further increased, and the required explosive power can be further reduced.

In particular, by forming the small-diameter cylindrical portion into a tapered shape whose diameter decreases toward the break portion, an effect is obtained that the loss of explosion energy can be reduced and a higher explosive force can be concentrated on the break portion. Can be

According to the structure in which the protective member for covering the housing is provided outside the housing, while the housing is made of, for example, a lightweight and easily moldable synthetic resin,
High safety can be ensured by the protective member on the outside.
In particular, according to the cover having a communication hole communicating between the inside and the outside thereof, the high pressure air ejected from the communication hole is prevented by suppressing the rise of the internal pressure of the cover at the time of the explosion and preventing the cover from bursting. An effect is obtained that the protection member can surely prevent hitting the parts and the like.

In the case where a filter for covering the installation portion of the communication hole is provided in the cover portion in which the communication hole is formed,
The filter can prevent the fragments blown out by the explosion of the explosive from jumping out of the communication hole to the outside without impairing the function of suppressing the increase in the internal pressure obtained by providing the communication hole.

Further, in the case where a waterproof portion for covering the installation portion of the communication hole is provided on the cover portion and the waterproof portion is broken by the explosive force of the explosive, the communication hole is normally provided. Water can be prevented from entering the cover through the waterproof portion, and when the explosive explodes, the waterproof portion is broken and air in the cover is discharged to the outside through the communication hole. Thereby, an increase in the internal pressure of the cover can be suppressed.

Also, a bottom plate for covering the lower surface of the cylindrical member into which the explosive has been inserted, an upper cover for covering the bottom plate and the upper portion of the cylindrical member, and a lower cover for covering the lower plate and the lower portion of the cylindrical member If the housing body is constituted by and the lower end of the upper cover and the upper end of the lower cover are configured so as to connect both ends in a state of being overlapped with each other, the periphery of the cylindrical member into which the explosive is inserted, Since it is covered by the upper cover and the lower cover, it is possible to effectively prevent the explosive force of the explosive from affecting the outside of the housing body.

When the lower cover is integrally formed so as to cover the lower outer surface of the upper cover and the outer surface of the bottom plate, the bottom plate, the upper cover, and the lower cover are firmly connected to each other. And the airtightness of the housing body can be improved.

According to the housing or the conductor fixed to the base, the loss of the explosion energy can be further reduced, and the concentration of the explosive force on the break can be further increased.

Here, if the housing or the conductor is fixed on the outer surface of the electric connection box, and the connection terminal portion is electrically connected to a circuit in the electric connection box, the conductor and the electric connection box can be connected. This eliminates the necessity of wiring such as a cable connecting the two, and can simplify the entire system.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional front view of a circuit breaker according to a second embodiment of the present invention.

FIG. 4 is a sectional front view of a circuit breaker according to a third embodiment of the present invention.

FIG. 5 is a sectional front view of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 6 is a sectional front view of a circuit breaker according to a fifth embodiment of the present invention.

FIG. 7 is a sectional front view of an explosive seal provided in the circuit breaker shown in FIG. 6;

FIG. 8 is a sectional front view of a circuit breaker according to a sixth embodiment of the present invention.

FIG. 9 is a sectional front view of a circuit breaker according to a seventh embodiment of the present invention.

FIG. 10 is a cross-sectional front view showing still another embodiment of the circuit breaker according to the present invention.

FIG. 11 is a cross-sectional front view showing still another embodiment of the circuit breaker according to the present invention.

FIG. 12 is a cross-sectional front view showing still another embodiment of the circuit breaker according to the present invention.

FIG. 13 is a sectional front view showing still another embodiment of the circuit breaker according to the present invention.

FIG. 14 is a sectional front view showing still another embodiment of the circuit breaker according to the present invention.

FIG. 15 is a sectional front view showing still another embodiment of the circuit breaker according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Housing main body 14 Outer cylinder part 16 Cover part 18 Communication hole 20 Conductor 22 Breaking part 26 Connection terminal part 30 Tube member 34 Inner cylinder part 40 Explosive seal part 42 Lead wire 44 Filament 46 Gunpowder 47 Capsule 48 Seal member 56 Filter 57 Waterproof sheet ( Waterproof part) 58 Closed part (waterproof part) 69, 77 Upper cover 70, 78 Lower cover 76 Bottom part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshimon Hosoda 1-7-10 Kikuzumi, Minami-ku, Nagoya, Aichi Prefecture Inside Harness Research Institute, Inc. (72) Inventor Motonori Kido, Kikuzumi, Minami-ku, Nagoya-shi, Aichi 1-7-10 Harness Research Institute, Inc. (72) Inventor Sakamoto Fukuma 1-7-10 Kikuzumi, Minami-ku, Nagoya City, Aichi Prefecture Harness Research Institute, Inc. (72) Inventor Hideaki Toyama Nagoya, Aichi Prefecture 1-7-10 Kikuzumi, Minami-ku, Yokohama Harness Research Institute, Inc. (72) Inventor Akio Matsumaru 1-7-10 Kikuzumi, Minami-ku, Nagoya, Aichi Prefecture Harness Research Institute, Inc. (72) Inventor Sugimoto Masashi 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi Harness Research Institute, Inc. (72) Inventor Yasukuni Yokkaichi, Mie Prefecture Nishisuehiro-cho, No. 1, No. 14 Sumitomo electric instrumentation within Co., Ltd.

Claims (16)

[Claims] 1. A housing made of an insulating material and having a cylindrical portion that opens in at least one direction, a cover portion that covers the opening while leaving a conductor accommodating space at the opening of the cylindrical portion, and connection terminal portions at both ends. And a conductor having a breakable portion that can be broken at an intermediate portion, and the broken portion of the conductor is disposed at the opening of the cylindrical portion in the conductor accommodating space. The two connecting terminal portions are led out of the housing in a state where the portion between them penetrates the housing, and the explosive and heating means for heating and exploding the explosive by external power supply are provided in the cylindrical portion. A circuit breaker, wherein the explosive force of the explosive causes the breaking portion to break. 2. The circuit breaker according to claim 1, wherein the explosive and its heating means are sealed in a seal member to form an explosive seal, and the explosive seal is inserted into the cylinder. Circuit breaker. 3. The circuit breaker according to claim 2, wherein said explosive, its heating means and a sealing member are integrally formed. 4. The circuit breaker according to claim 2, wherein said explosive and a heating means therefor are enclosed in a capsule. 5. The circuit breaker according to claim 4, wherein said capsule is made of a heat-shrinkable resin. 6. The circuit breaker according to claim 1, wherein the housing has a housing main body having an outer cylindrical portion opening inward and outward and the cover portion, and an inner cylinder opening in one direction. And a tubular member inserted into the outer tubular portion in a state where the inner tubular portion has an opening inside the housing main body, and the explosive is inserted into the inner tubular portion. Circuit breaker. 7. The circuit breaker according to claim 1, wherein a small-diameter cylindrical portion having a smaller diameter than the cylindrical portion is provided in the cylindrical portion at a position between the explosive and the heating means and the breaking portion. A circuit breaker comprising: 8. The circuit breaker according to claim 7, wherein the inner peripheral surface of the small-diameter cylindrical portion has a tapered shape whose diameter decreases toward the break portion. 9. The circuit breaker according to claim 1, wherein a protection member for covering the housing is provided outside the housing. 10. The circuit breaker according to claim 9, wherein
A circuit breaker, wherein a communication hole communicating the inside and outside of the cover is provided in the cover. 11. The circuit breaker according to claim 10, wherein a filter for covering the installation portion of the communication hole is attached to the cover. 12. The circuit breaker according to claim 10, wherein a waterproof portion for covering the installation portion of the communication hole is provided on the cover portion, and the waterproof portion is broken by an explosive force of the explosive. A circuit breaker characterized by comprising. 13. The circuit breaker according to claim 6, wherein
A bottom plate that covers the lower surface of the cylindrical member into which the explosive has been inserted,
An upper cover that covers the upper portion of the bottom plate and the tubular member, and a lower cover that covers a lower portion of the bottom plate and the tubular member form a housing body, and include a lower end of the upper cover and an upper end of the lower cover. A circuit breaker characterized in that both ends are connected in a state of overlapping. 14. The circuit breaker according to claim 6, wherein
A bottom plate that covers the lower surface of the cylindrical member into which the explosive has been inserted,
An upper cover that covers the upper portion of the bottom plate and the tubular member, and a lower cover that covers the lower portion of the bottom plate and the tubular member form a housing body, and a lower outer surface of the upper cover and an outer surface of the bottom plate. A circuit breaker, wherein a lower cover is formed integrally so as to cover the circuit breaker. 15. The circuit breaker according to claim 1, wherein the housing or the conductor is fixed to a base. 16. The circuit breaker according to claim 15, wherein the housing or the conductor is fixed on an outer surface of the electric connection box, and the connection terminal portion is electrically connected to a circuit in the electric connection box. Features a circuit breaker.